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COMMITMENTS AND CONTINGENCIES - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
counterparty
Dec. 31, 2017
USD ($)
Dec. 31, 2003
Letters of Credit [Abstract]      
Letters of credit outstanding $ 3 $ 3  
Risk Participation Agreements [Abstract]      
Risk participation agreements $ 19 16  
Risk participation agreements number of counterparties | counterparty 84    
Risk participation agreements, Maximum term 10 years    
Commercial loans held for sale | Purchase commitment      
Commitments [Abstract]      
Unsettled commercial loan trade purchases $ 68 65  
Unsettled commercial loan trade sales $ 161 132  
Minimum      
Risk Participation Agreements [Abstract]      
Risk participation agreements, Average term 1 year    
Maximum      
Risk Participation Agreements [Abstract]      
Risk participation agreements, Average term 5 years    
Marketing rights      
Marketing Rights [Abstract]      
Commitment period     25 years
Payments made $ 4 $ 3  
Remaining obligation due $ 37    
Financial standby letters of credit      
Letters of Credit [Abstract]      
Letters of credit terms 10 years    
Commercial letters of credit      
Letters of Credit [Abstract]      
Letters of credit terms 1 year